Defining a Relation Schema in SQL

Now we shall begin a discussion of data definition, the portions of SQL that involve explaining the structure of information in the database. On the contrary, the aspects of SQL discussed previously - queries and modifications - are often called data manipulation.

Scrolling Cursors

Cursors give us a choice of how we move through the tuples of the relation. The default, and most common choice is to start at the beginning and fetch the tuples in order, until the end. On the other hand, there are other orders in which tuples may be fetched, and tuples could be

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